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                <h1 class="title-article">Python 2与Python 3的区别</h1>
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                    <span class="time">最后发布于2018-08-19 13:33:09                    </span>
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                                            <p>越来越多的库要放弃Python 2了，我也开始转向Python 3了。最近的项目开始用Python3写了，也体会了一下2和3的区别。主要的一些区别在以下几个方面：</p>

<ul><li>print函数</li>
	<li>整数相除</li>
	<li>Unicode</li>
	<li>异常处理</li>
	<li>xrange</li>
	<li>map函数</li>
	<li>不支持has_key</li>
</ul><p> </p>

<h2>print函数</h2>

<p>Python 2中print是语句（statement），Python 3中print则变成了函数。在Python 3中调用print需要加上括号，不加括号会报SyntaxError</p>

<p>Python 2</p>

<pre class="has">
<code>print "hello world"
</code></pre>

<p>输出</p>

<pre class="has">
<code>hello world
</code></pre>

<p> </p>

<p>Python 3</p>

<pre class="has">
<code>print("hello world")
</code></pre>

<p>输出</p>

<pre class="has">
<code>hello world
</code></pre>

<p> </p>

<pre class="has">
<code>print "hello world"
</code></pre>

<p>输出</p>

<pre class="has">
<code> File "&lt;stdin&gt;", line 1
    print "hello world"
                      ^
SyntaxError: Missing parentheses in call to 'print'
</code></pre>

<p> </p>

<h2>整数相除</h2>

<p>在Python 2中，3/2的结果是整数，在Python 3中，结果则是浮点数</p>

<p>Python 2</p>

<pre class="has">
<code>print '3 / 2 =', 3 / 2
print '3 / 2.0 =', 3 / 2.0
</code></pre>

<p>输出</p>

<pre class="has">
<code>3 / 2 = 1
3 / 2.0 = 1.5
</code></pre>

<p> </p>

<p>Python 3</p>

<pre class="has">
<code>print('3 / 2 =', 3 / 2)
print('3 / 2.0 =', 3 / 2.0)
</code></pre>

<p>输出</p>

<pre class="has">
<code>3 / 2 = 1.5
3 / 2.0 = 1.5
</code></pre>

<p> </p>

<h2>Unicode</h2>

<p>Python 2有两种字符串类型：str和unicode，Python 3中的字符串默认就是Unicode，Python 3中的str相当于Python 2中的unicode。</p>

<p>在Python 2中，如果代码中包含非英文字符，需要在代码文件的最开始声明编码，如下</p>

<pre class="has">
<code># -*- coding: utf-8 -*-
</code></pre>

<p>在Python 3中，默认的字符串就是Unicode，就省去了这个麻烦，下面的代码在Python 3可以正常地运行</p>

<pre class="has">
<code>a = "你好"
print(a)
</code></pre>

<p> </p>

<h2>异常处理</h2>

<p>Python 2中捕获异常一般用下面的语法</p>

<pre class="has">
<code>try:
    1/0 
except ZeroDivisionError, e:
    print str(e)
</code></pre>

<p>或者</p>

<pre class="has">
<code>try:
    1/0 
except ZeroDivisionError as e:
    print str(e)
</code></pre>

<p>Python 3中不再支持前一种语法，必须使用as关键字。</p>

<p> </p>

<h2>xrange</h2>

<p>Python 2中有 range 和 xrange 两个方法。其区别在于，range返回一个list，在被调用的时候即返回整个序列；xrange返回一个iterator，在每次循环中生成序列的下一个数字。Python 3中不再支持 xrange 方法，Python 3中的 range 方法就相当于 Python 2中的 xrange 方法。</p>

<p> </p>

<h2>map函数</h2>

<p>在Python 2中，map函数返回list，而在Python 3中，map函数返回iterator。</p>

<p>Python 2</p>

<pre class="has">
<code>map(lambda x: x+1, range(5))
</code></pre>

<p>输出</p>

<pre class="has">
<code>[1, 2, 3, 4, 5]
</code></pre>

<p> </p>

<p>Python 3</p>

<pre class="has">
<code>map(lambda x: x+1, range(5))
</code></pre>

<p>输出</p>

<pre class="has">
<code>&lt;map object at 0x7ff5b103d2b0&gt;
</code></pre>

<p> </p>

<pre class="has">
<code>list(map(lambda x: x+1, range(5)))
</code></pre>

<p>输出</p>

<pre class="has">
<code>[1, 2, 3, 4, 5]
</code></pre>

<p>filter函数在Python 2和Python 3中也是同样的区别。</p>

<p> </p>

<h2>不支持has_key</h2>

<p>Python 3中的字典不再支持has_key方法</p>

<p>Python 2</p>

<pre class="has">
<code>person = {"age": 30, "name": "Xiao Wang"}
print "person has key \"age\": ", person.has_key("age")
print "person has key \"age\": ", "age" in person
</code></pre>

<p>输出</p>

<pre class="has">
<code>person has key "age":  True
person has key "age":  True
</code></pre>

<p> </p>

<p>Python 3</p>

<pre class="has">
<code>person = {"age": 30, "name": "Xiao Wang"}
print("person has key \"age\": ", "age" in person)
</code></pre>

<p>输出</p>

<pre class="has">
<code>person has key "age":  True
</code></pre>

<p> </p>

<pre class="has">
<code>print("person has key \"age\": ", person.has_key("age"))
</code></pre>

<p>输出</p>

<pre class="has">
<code>Traceback (most recent call last):
  File "&lt;stdin&gt;", line 1, in &lt;module&gt;
AttributeError: 'dict' object has no attribute 'has_key'
</code></pre>

<p> </p>

<p>以上是最近整理的一些，后续会继续更新，也欢迎大家补充。</p>

<p>本文已更新微信同名公众号【Python与数据分析】，欢迎关注~</p>                                    </div>
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